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6x - y = 5 ......(I)
y = -5x + 17
5x + y = 17........(II)
6x - y = 5 subtitusi 6x - y = 5
5x + y = 17 6.2 - y = 5
per -y = 5 - 12
11x = 22 y = 7
x = 2